Machine for making thermophone-blanks



A. M. VAN DOORN. MACHINE FOR MAKING THERMOPHONE BLANKS.

APPLICATION FILED MAR. 1, 1919.

1,338,886. Patented May 4, 1920.

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APPLICATION FILED MAR-M1919.

Patented May 1, 1920.

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A. M. VAN DOORN.

MACHINE FOR MAKING THERMOPHONE BLANKS.

AFPLICATION FILED MAR-1| 1919 1,338,886.

[/7- TOR A. M. VAN DOORN. MACHINE FOR MAKING THERMOPHONE BLANKS. APPLICATION FILED MAR. @1919.

1,338,886. Patented May 4,1920.

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ANTHONIUS M. VAN DOORN, OF NEWTOII, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 AMERICAN THERMOPI-IONE COMPANY, OF BOSTON, MASSA- CHUSETTS, A CORPORATION OF MASSACHUSETTS.

MACHINE FOR MAKING THERMOPHONE-BLANKS.

messes.

To alt whom it may concern: 1

it known that I, AN'rHoNIns M. van 1h 121$, of Utrecht, Holland, a subject oi Wilhelmina, Queen of the Netherlands, residing in Newton, Massachusetts, have invented a new and useful Improvement in Machines for li laking T hermophone-Blanks, oil? which the following is a specification.

T he type of thermophone for the ma ring of which my invention is designed comprises in complete form a so-called capsule having two terminals annular-shaped, separated by insulation and connected by a plurality of loops made of .Vollaston wire from the loop portion of which the silver or other coating of the wire has been etched by acid, the loops being in parallel.

The difiiculty in making such thermophones lies in the facts, first, that each thermophone must have a predetermined resistance, and, second, that each loop must be of substantially the same resistance as every other loop, and, for this purpose must have exactly the same amount of its coating etched off from it as every other loop, so that the core of each loop will be of exactly the same length. Moreover, the loops must be entirely out of contact with each other to prevent short-circuiting, which would cause the burning out or oxidizing of the loops in contact and hence render the ther mophone as a whole of inferior character. The Wollaston wires used are of very small diameter or gage, say 10 microns, and when etched the platinum wire, which is ordinarily used as the core for such wire, is say 2 microns in diameter, and therefore the wires themselves cannot be handled. The thermophone having been constructed in this way is covered with a cap which serves both as a protection to the loops and also as a resonance chamber, and the completed device is inch high.

The purpose of my present machine is to perform the first portion of the operation of constructing the device, that is, the permanent attachment to a proper mounting of one end of each of the wires which are to form the loops in such a manner that the blank so formed can be transferred handily to a second machine by which the thermo phone will be completed with the exception of the addition of the cap providing a pro- Specification of Letters Patent.

Application filed March 1, 1919. Serial No. 280,167.

inch indiameter by say of an- Patented May 4, 1920.

tection and resonance chamber, a machine the finishing of the device formin a part of a second application for Letters $2M- ent, filed contemporaneously herewith Serial No. 280,168. I I

It may be stated here that the finished inch in thermophone is approximately diameter, with the top added is of an inch igh, and that the machine to be described provides for the applying of 18 Wollaston wires to a ring which forms the base of the blank.

My invention will be understood by reference to the drawings, in which- Figure 1 is a side elevation of a machine embodying my invention;

Fig. 2 is a longitudinal section thereof;

Figs. 2 and 2 are enlarged cross-sections on lines Qfi-Q and 2 of Fig. 2;

Fig. 3 is a view with the cover removed of that end of the machine which carries the spools for the wire;

Fig. 4 is a section on line H of Fig. 1, looking in the direction of the arrow;

Fig. 5 is a section on line 5-5 of Fig. 1, showing the crimping or spinning mechanism;

Figs. 6, 7 and 8 are sectional details showing the crimping and cutting operation;

Fig. 9 is a section on line 99 of Fig. 6; and

Fig. 10 shows the product of this machine in side elevation.

It must be remembered that these views are enlarged several times, a full-sized machine being only about one-third larger than the size shown in Figs. I to 5.

In the drawings I A is a. base or table carrying rails a on its upper surface and being slotted at at a to allow a longitudinal adjustment of the work support and tool carrier, B is the work support which runs on the rails a and may be fastened in place by a screw 6 and washer 5 this screw passingtthrough the slot a The work support B is forked as shown, forming two supports for the hollow shaft 0 which carries a pulley c by which power may be applied to it by a belt from a treadle or other source. This hollow shaft C carries within it a sleeve 0 which is attached at its rear end to the spool carrier by a coupling 0 and enlarged at points along its length to form grooves 0 corresponding in number with the number of wires which are to be fed to form the thermophone (see Fig. 2 where the parts are very much enlarged). In practice it is desirable to surround the wires by a rubber ring a to hold them in register with the grooves this ring being shown in Figs. 6, 7 and 8. Within the sleeve 0 is a spindle C the forward end of which is threaded as at 0. Near its rear portion the spindle is squared, where it passes through the coupling 6 to be rotated by the spool carrier E. Ball bearings of usual character in which the hollow shaft C turns are shown at D, being suitably held in place and lubricated through the oil. holes (Z. These bearings are held in place against a shoulder on shaft C at one end by a nut (Z and at the other end by the spool carrier E.

To the shaft 0 is attached in any convenient way to turn therewith a spool carrier E attached to which is a plate E carrying supports a between each pair of which is mounted a spool E The plate E is slot ted as at e and through these slots pass the wires 00 to the grooves 0 in the sleeve 0 The open end of the spool carrier is covered by a cover E It has an opening in the center through which passes the hub F attached to the plate E The spindle O has a handle F at its rear end by which it may be given a longitudinal forward movement and may be locked into the hub F. For this purpose the hub F has a longitudinal slot one wall of which is shown at f, Fig. 2. The wall 7 is recessed as at f so that it may receive the screwhead 7. When the spindle C is to be held in its rearward position the screwhead 7 is caused to engage the edge of the hub F as in Fig. 2. When it is desired to throw the spindle forward it is turned so that the screw will register with the slot. The spindle may then be pushed forward and then turned so that the screw-head will lock in the recess P. The slot f and recess 7 thus form a bayonet groove to cooperate with the screw f to lock the spindle in forward position. 7 Thus the spindle has a forward and rearward movement and also may be caused to rotate with the hollow shaft C.

G is a collar attached to the forked outer end of the hollow shaft C and grooved on its inner surface as at g to receive the wires from the grooves 0 It keeps the wires in proper relation as they leave the grooves 0 and acts as a guide'for the wires as they leave the sleeve, guiding the ends of them toward the surface of the spindle (l (See Fi 2 The first step in the making of the blank will be understood from Fig. 6 where the core has been placed upon the spindle, the wires :1: being in the position shown in Fig. 2. The wires 00 engage the core H and are surrounded by the thimble H. the cylindrical portion of which serves as a binding to against the core H by means of a thin metal cap H. This as shown is accomplished by means of a tool shown in section in Fig. 2 and front view in Fig. 5. r

J is a tool support which comprises a bearing J for a rod or spindle J 2 having preferably a handle J at its outer end. This tool support is adjustably mounted on the rails a and clamped in place by the screw j and washer j The rod is grooved as at y' and kept from; turning by the screw j passing through the bearing J into the groove. lts front end carries a disk-shaped tool carrier J which serves as a bearing for an annular cam carrier J, a grooved ring J being attached by screws tothe tool carrier J to engage and hold in place an annular tongue j, see Fig. 2, from the annular cam carrier J this being a convenient way of holding the tool holder in place on the disk J and allowing itto be oscillated to operate the tools.

The tool proper comprises three rolls 70 mounted on levers K which are attached by screws 75 to the tool carrier J so that these 'ihese lovers are levers K may be root. .d. shaped near their free ends as at k to form fingers which lie between screws 70 mounted on the cam carrier J so that when thispart J is oscillated in one direction the tools is will be forced toward the center of the dish J and when oscillated in the other direction will be moved away from it. The part J has two projections 7" to enable it to be oscillated by hand. The peripheries of the tools are shaped to conform to the periphery of the core H which is preferablyof varying diameters so as to fori'n a good holding surface for the wires Fragments of these rolls 7c are shown in Fig. 6 in a position out of contact with the thimble ll. In practice, the wires .1? being in position as shown in Fig. 2 and the core H of the blank having been put onto the screw 0 under the wires and against the piece G, the cap or thimble H is placed over the ends of the wires and locked by the nut 0 Power being applied to the pulley 0 to rotate the core, thiinble, and wires, the tool carrier J is moved up into place so that the tools 7." are in the same vertical plane as the thimble (see'Fig. 6), and the part J is turned by means of the projection j", so that the tools 76 are thrown into engagement with, and held against. the thiinble If and crimp or spin the thimble inst the core H as shown in Fig. 7.

The thimble is thus closely compressed against the core so as to hold the wires firmly in place between the core and the thimble. A reverse turn is then given to the tool holder .l'" so that the tools resume the position shown in Fig. 6 and the tool carrier is withdrawn.

Thereafter and while the spindle is still rotating it is given a forward movement by turning the treadle so that the screw f will register with the groove 7', pushing on the handle F so that the screw f will slide down the groove and then by turning the handle the shaft is locked in its forward position by the screw f to continue its rotation in its forward position shown in Fig. 8. By this movement a certain amount of wire is drawn off from the spools because of their attachment to the core by means of the thimble (see Fig. 8) and the wires are then out 01f to complete the blank. For this purpose I have attached to the work support B, preferably by means of a plate L, which is slotted and adjustably held thereto by screws Z, a cutter M, preferably a disk knife supported in a forked support M mounted on the end of a horizontal shaft M so that the knife may be brought up into cutting position as desired. The parts being in the position shown in Fig. 8 and the shaft still rotating, the knife blade M is brought into contact with the wires so that it cuts them, and the blank is thus finished ready for removal to the second machine in which the mechanical construction of the thermophone is finished. Stops m and m limit the throw of the support M the stop m being preferably adjustable.

During all this time the core is held in place by the nut 0 which must be removed in order to allow the blank to be taken off from the machine.

The mechanisms shown are of a character and arranged in a manner which seems to me best, but other like mechanisms and arrangements such as will occur to those skilled in the art will come within the scope of my invention.

\Vhat I claim as my invention is 1. In a machine of the kind described, a rotary work-holder adapted to hold a core, means adapted to rotate with said workholder for supplying a plurality of wires to said core, means for drawing said wires from said supply, and means for attaching said wires to said core.

2. In a machine of the kind described, a rotary work-holder having means at one end thereof to hold a core, means for supplying a plurality of Wires to the periphery of said core, and means for crimping a binder around said wires and core whereby" said wires will be clamped against said core.

3. In a machine of the kind described, a rotary work-holder having means at one end thereof to hold a core, means for supplying a plurality of wires to the periphery of said core, means for crimping a binder around said wires and core whereby said wires will be clamped against said core, and means for, cutting said wires adapted to be operated after said wires have been so clamped.

a. In a machine of the kind described, a rotary work-holder comprising a spindle and adapted to carry a core at one end thereof, a wire supply comprising a plurality of spools, and a sleeve having a series of channels and located about said spindle to rotate therewith and lead the wires from said spools to said core.

5. In a machine of the kind described, a rotary work-holder comprisin a spindle and adapted to carry a core at one end thereof, a wire supply connected to said spindle comprising a plurality of spools, a sleeve having a series of channels, said sleeve being located about said spindle to rotate therewith and lead the wires from said spools .to said core, and means to hold the wires in said channels.

6. In a machine of the kind described, a rotary work-holder comprising a spindle adapted to carry a core at one end thereof, a sleeve located about said spindle, said sleeve being channeled longitudinally, a spool carrier connected to said sleeve to rotate therewith and comprising a plurality of spools located whereby wires may be led therefrom to said channels, and a hollow shaft surrounding said spindle and said sleeve and connected with both, and means for applying power to said shaft whereby said sleeve and said spindle will be rotated.

7. In a machine of the kind described, a rotary work-holder comprising a spindle adapted to carry a core at one end thereof, a channeled sleeve located about said spindle, and a hollow shaft located about said sleeve, said spindle, said sleeve and said shaft being connected to rotate together, and a spool carrier connected to one end of said workholder to rotate therewith and adapted to allow wire to be drawn therefrom through the channels in said sleeve.

8. In a machine of the kind described, a rotary work-holder comprising a spindle adapted to carry a core at one end thereof, a channeled sleeve located about said spindle, and a hollow shaft located about said sleeve, said spindle, said sleeve and said shaft being connected to rotate together, a spool carrier connected to one end of said work-holder to rotate therewith and adapted to allow wire to be drawn therefrom through the channels in said sleeve, and a collar connected to said hollow shaft and having channels along its interior to lead wires from said sleeve channels to said core.

9. In a machine of the kind described, a

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rotary work-holder comprising a spindle adapted to hold a core, a channeled sleeve located about said spindle, means for supplying wires to the channels in said sleeve, means for attaching said wires to said core, said spindle being movable longitudinally whereby when said wires have been so attached, said spindle carrying said core may be moved longitudinally to withdraw a given length of wire "from the wire supply, and means for cutting said wires.

10. In a machine of the kind described, means for supporting and rotating a core,

7 meansi'or supplying wires to the periphery of the core, means for causing a binder to clamp the wires against the core, said means comprising a plurality of rolls, and means for moving them centripetaliy to engage said binder and shape it against said core.

11.. In a machine of the kind described, a clamping mechanism comprisinga circular stationary member, one or more levers fulcrumed thereon, each carrying a forming roll and a cam surface, and an' annular movable membcr mounted on said member to move thereon and having means adapted to engage the cam surfaces on said. levers to throw the forming rolls toward and from the center of said stationary member.

12. In a machine of the kind described, a clamping mechanism comprising a circular stationary member, one or more levers 'lulcrumed thereon, each carrying a forming roll and a cam surface, an annular movable member mounted on said stationary memher to move thereon and having means adapted to engage the cam surfaces on said levers to throw the forming rolls toward and from the center of said stationary member, and a rotary work-holder located to hold the workconcentricall with relation to said annular movable member.

ANTHONIUS M. VAN Di) l-tN stationary s 

